Parking lot congestion degree calculation device, parking lot congestion degree calculation program, and parking lot congestion degree calculation system

Abstract

To highly accurately calculate a parking rate / congestion degree of each one of respective vehicle types even when the parking rate / congestion degree of a certain vehicle type is higher.SOLUTION: A parking lot congestion degree calculation device 1 includes a parking vehicle number calculation section 12 and a parking rate calculation section 14. The parking vehicle number calculation section calculates this-time parking vehicle numbers of respective vehicle types based on last-time parking vehicle numbers of the respective vehicle types, recent entering vehicle numbers of the respective vehicle types, and recent leaving vehicle numbers of the respective vehicle types. When the this-time parking rate / congestion degree of a certain vehicle type exceeds 100% in calculating this-time parking rates / congestion degrees of the respective vehicle types based on the this-time parking vehicle numbers of the respective vehicle types and parking frame numbers for the respective vehicle types, the parking rate calculation section calculates the this-time parking rates / congestion degrees of the other vehicle types when the certain vehicle type parks at the parking frame for the other vehicle types based on how many certain-vehicle types are excluded from the parking frames for the certain-vehicle type and also based on the number of the other vehicle types which are converted into the one certain-vehicle type.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to a technique for calculating a parking rate or a congestion degree of a parking lot. [Background technology]

[0002] A technology for calculating the parking rate or congestion level of a parking lot is disclosed in Patent Document 1 and the like. In Patent Document 1, images of license plates are acquired from cameras installed at the entrance and exit of the parking lot, and standard vehicles and large vehicles are identified based on the license plate recognition results. Then, the current number of standard vehicles and large vehicles is calculated based on the previous number of parked standard vehicles and large vehicles, the most recent number of entering standard vehicles and large vehicles, and the most recent number of exiting standard vehicles and large vehicles, and the current parking rate or congestion level of standard vehicles and large vehicles is calculated based on the current number of parked standard vehicles and large vehicles and the number of parking spaces for standard vehicles and large vehicles. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2001-291194 A [Patent Document 2] JP 2018-005786 A Summary of the Invention [Problem to be solved by the invention]

[0004] Patent Document 1 does not take into account the fact that standard vehicles park in parking spaces for large vehicles when the parking rate or congestion rate for standard vehicles is high, and that large vehicles park in parking spaces for standard vehicles when the parking rate or congestion rate for large vehicles is high, and therefore cannot calculate the parking rate or congestion rate for standard vehicles and large vehicles with high accuracy.

[0005] Therefore, in order to solve the above problem, an object of the present disclosure is to calculate the parking rate or congestion rate of each vehicle type with high accuracy even when the parking rate or congestion rate of a certain vehicle type is high. [Means for solving the problem]

[0006] In order to solve the above problem, when the parking rate or congestion rate of a certain vehicle type is high, the parking rate or congestion rate of each vehicle type is calculated based on how many vehicles of that vehicle type are excluded from the parking space for that vehicle type and how many vehicles of other vehicle types each vehicle of that vehicle is equivalent to.

[0007] Specifically, the present disclosure is a parking lot congestion degree calculation device that includes a parked vehicle number calculation unit that calculates the current number of parked vehicles for each vehicle type based on the previous number of parked vehicles for each vehicle type, the most recent number of vehicles entering for each vehicle type, and the most recent number of vehicles exiting for each vehicle type, and a parking rate calculation unit that, when calculating the current parking rate or congestion degree for each vehicle type based on the current number of parked vehicles for each vehicle type and the number of parking spaces for each vehicle type, calculates the current parking rate or congestion degree of other vehicle types when the vehicle type is parked in a parking space for other vehicle types based on how many vehicles of the vehicle type were excluded from the parking space for that vehicle type and how many vehicles of the vehicle type are converted into by one vehicle of that vehicle type when the parking rate or congestion degree of the other vehicle type exceeds 100%.

[0008] According to this configuration, when the parking rate or congestion level of a certain vehicle type is high, it is taken into consideration that the vehicle type will be parked in a parking space for other vehicle types, so that the parking rate or congestion level of each vehicle type can be calculated with high accuracy.

[0009] The present disclosure also relates to a parking lot congestion degree calculation device, further comprising an entry / exit number calculation unit that acquires information on radar reflection points from a radar transmitting / receiving device installed at the parking lot entrance and the parking lot exit, identifies each vehicle type based on clustering of the radar reflection points, and calculates the most recent number of entering vehicles of each vehicle type and the most recent number of exiting vehicles of each vehicle type.

[0010] With this configuration, instead of using an imaging system that monitors part of the parking lot (which has low installation and maintenance costs but low accuracy of parking rate or congestion rate), or a buried system installed in each parking space (which has high accuracy of parking rate or congestion rate but high installation and maintenance costs), it is possible to use a radar system that monitors the entrances and exits of the parking lot (which has low installation and maintenance costs, high accuracy of parking rate or congestion rate, and is not affected by the surrounding weather, etc.).

[0011] The present disclosure also relates to a parking lot congestion degree calculation program that is installed in a computer to cause the computer to function as the parking lot congestion degree calculation device described above.

[0012] The present disclosure also provides a parking lot congestion degree calculation system comprising the parking lot congestion degree calculation device described above and a radar transmitting and receiving device installed at the parking lot entrance and the parking lot exit.

[0013] According to these configurations, it is possible to provide a parking lot congestion degree calculation program and a parking lot congestion degree calculation system having the same effects as those described above. Effect of the Invention

[0014] In this way, the present disclosure can calculate the parking rate or congestion level of each vehicle type with high accuracy even when the parking rate or congestion level of a certain vehicle type is high. [Brief description of the drawings]

[0015] [Figure 1] 1 is a diagram illustrating a configuration of a parking lot congestion degree calculation system according to the present disclosure. [Diagram 2] FIG. 4 is a diagram illustrating processing of a radar transceiver device according to the present disclosure. [Diagram 3] 1 is a diagram illustrating a configuration of a parking lot congestion degree calculation device according to the present disclosure. [Figure 4] FIG. 13 is a diagram showing a process for calculating the number of parking spaces according to the present disclosure. [Diagram 5] FIG. 13 is a diagram showing a specific example of calculation of the number of parking spaces according to the present disclosure. [Figure 6] A diagram showing the setting of the assumed ratio of the number of shared use squares in the present disclosure. [Figure 7] FIG. 13 is a diagram showing the parking rate calculation process of the present disclosure. [Figure 8] FIG. 13 is a diagram showing a specific example of parking rate calculation according to the present disclosure. [Figure 9] FIG. 13 is a diagram showing a specific example of parking rate calculation according to the present disclosure. [Figure 10] FIG. 13 is a diagram showing the parking rate for each vehicle type of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present disclosure will be described with reference to the accompanying drawings. The embodiments described below are examples of the present disclosure, and the present disclosure is not limited to the following embodiments.

[0017] (Configuration of the parking lot congestion degree calculation system disclosed herein) The configuration of a parking lot congestion degree calculation system according to the present disclosure is shown in Fig. 1. The processing of the radar transmitting and receiving device according to the present disclosure is shown in Fig. 2. The configuration of a parking lot congestion degree calculation device according to the present disclosure is shown in Fig. 3.

[0018] Parking lot congestion degree calculation system C is applied to a parking lot P on an expressway, but may also be applied to a parking lot P on a general road. A small car S is parked not only in a parking space PS for small cars S, but also in a space PC shared by small cars S and large cars B. A large car B is parked not only in a parking space PB for large cars B, but also in a space PC shared by large cars B and small cars S.

[0019] The parking lot congestion degree calculation system C includes a parking lot congestion degree calculation device 1, an available / unavailable information board control device 2, an available / unavailable information board 3, a radar transceiver 4, a radar transceiver 5, and a network 6. The parking lot congestion degree calculation device 1 includes an entry / exit number calculation unit 11, a parked vehicle number calculation unit 12, a parkable vehicle capacity calculation unit 13, and a parking rate calculation unit 14, and can be realized by installing the parking lot congestion degree calculation programs shown in Figures 4 and 7 on a computer.

[0020] The radar transmitter / receiver 4 is installed at the entrance of the parking lot P and monitors an entrance measurement area MI in the entrance lane LI. The radar transmitter / receiver 5 is installed at the exit of the parking lot P and monitors an exit measurement area MO in the exit lane LO. A millimeter wave radar may be applied as the radar transmitter / receivers 4 and 5. Cameras or counters may be placed instead of the radar transmitters / receivers 4 and 5.

[0021] The radar sensor of the radar traffic volume measurement device disclosed in Patent Document 2 can be applied as the radar transmitter / receiver devices 4 and 5. Here, the radar sensor disclosed in Patent Document 2 is applicable to the cases where a vehicle runs away from the radar sensor and the cases where a vehicle approaches the radar sensor. Therefore, the radar sensor disclosed in Patent Document 2 may be applied to the radar transmitter / receiver device 5 installed at the exit of the parking lot P so as to detect only vehicles running away from the radar sensor. On the other hand, the radar sensor disclosed in Patent Document 2 may be applied to the radar transmitter / receiver device 4 installed at the entrance of the parking lot P so as to detect only vehicles approaching the radar sensor.

[0022] (Processing for calculating the number of parking spaces disclosed herein) The process of calculating the number of parking spaces disclosed herein is shown in Fig. 4. A specific example of the calculation of the number of parking spaces disclosed herein is shown in Fig. 5. The setting of the expected ratio of the number of shared spaces disclosed herein is shown in Fig. 6.

[0023] The entry / exit vehicle count calculation unit 11 executes the processes of steps S1 and S2 at predetermined time intervals.

[0024] The entry and exit vehicle number calculation unit 11 acquires radar reflection point information from the radar transmitting and receiving devices 4 and 5 via the network 6, and distinguishes between large vehicles B and small vehicles S based on the clustering of the radar reflection points (step S1). The clustering unit of the radar traffic volume measurement device disclosed in Patent Document 2 can be used as the entry and exit vehicle number calculation unit 11.

[0025] Based on the identification results between large vehicles B and small vehicles S, the entry / exit number calculation unit 11 calculates the most recent entry number Bin of large vehicles B, the most recent exit number Bout of large vehicles B, the most recent entry number Sin of small vehicles S, and the most recent exit number Sout of small vehicles S (step S2).

[0026] The parked vehicle number calculation unit 12 executes the processes of steps S3 and S4 at predetermined time intervals.

[0027] The parked vehicle number calculation unit 12 calculates the current number of parked large vehicles B, Bt=Bt-1+Bin-Bout, based on the previous number of parked large vehicles B, Bt-1, the most recent number of entering large vehicles B, Bin, and the most recent number of exiting large vehicles B, Bout (step S3). Here, the previous number of parked large vehicles B, Bt-1, may be visually measured by the operator at an initial stage.

[0028] The parked vehicle number calculation unit 12 calculates the current number of parked compact vehicles S St=St-1+Sin-Sout based on the previous number of parked compact vehicles S St-1, the most recent number of entering compact vehicles S S, and the most recent number of exiting compact vehicles S S (step S4). Here, the previous number of parked compact vehicles S St-1 may be visually measured by the operator at an initial stage.

[0029] The parking capacity calculation unit 13 executes the processes of steps S5 and S6 at predetermined time intervals.

[0030] The parking capacity calculation unit 13 calculates the number of parking spaces Bp=Bmax+CR for large vehicle B in the entire parking lot P based on the number of parking spaces Bmax for large vehicle B, the number of shared spaces C between large vehicle B and small vehicle S, the number of parking spaces 1 in each shared space PC for large vehicle B, and the estimated ratio R of the number of used spaces in all shared spaces PC for large vehicle B (step S5).

[0031] In Figure 5, the number of parking spaces for large vehicles B is Bmax = 10, the number of shared spaces C between large vehicles B and small vehicles S is 10, and the estimated ratio R of the number of used spaces to the total number of shared spaces PC for large vehicles B is 0.5, so the total number of parking spaces Bp for large vehicles B in the entire parking lot P is 15.

[0032] The parking capacity calculation unit 13 calculates the number of parking spaces Sp=Smax+2C(1-R) ​​for small vehicles S in the entire parking lot P based on the number of parking spaces Smax for small vehicles S, the number of shared spaces C between small vehicles S and large vehicles B, the number of parking spaces 2 in each shared space PC for small vehicles S, and the estimated ratio 1-R of the number of used spaces in all shared space PCs for small vehicles S (step S6).

[0033] In Figure 5, the number of parking spaces for small vehicles S is Smax = 10, the number of shared spaces C between small vehicles S and large vehicles B is 10, and the estimated ratio of the number of used spaces to the total number of shared spaces PC for small vehicles S is 1-R = 0.5, so the total number of parking spaces Sp for small vehicles S in the entire parking lot P is 20.

[0034] The parking capacity calculation unit 13 may set the estimated proportion R of the number of occupied spaces in the entire shared space PC for large vehicle B to the estimated proportion R of the number of occupied spaces in the entire shared space PC for large vehicle B according to the time of day (morning, noon, night, etc.) or date (holiday, etc.) (step S5).

[0035] The parking capacity calculation unit 13 may set the estimated proportion 1-R of the number of occupied spaces in the entire shared space PC for small vehicles S to the estimated proportion 1-R of the number of occupied spaces in the entire shared space PC for small vehicles S according to the time of day (morning, noon, night, etc.) or date (holiday, etc.) (step S6).

[0036] In Figure 6, the expected ratio R of the number of used spaces in the entire shared space PC for large vehicle B is set to 40% in the morning, 20% in the afternoon, and 100% at night on all days of the week as a general rule. The expected ratio R of the number of used spaces in the entire shared space PC for large vehicle B is exceptionally set to 20% in the morning, 10% in the afternoon, and 100% at night during periods D1 and D2 such as consecutive holidays. However, it is acceptable to set an appropriate value according to the usage status of parking lot P, without being limited to the above values.

[0037] The parking capacity calculation unit 13 can also calculate the parking capacity Bp in the entire parking lot P for the large vehicle B based on the estimated proportion of the "number of parked vehicles" in the entire shared space PC for the large vehicle B. However, it is necessary to calculate the estimated proportion R of the "number of used spaces" in the entire shared space PC for the large vehicle B based on the estimated proportion of the "number of parked vehicles" in the entire shared space PC for the large vehicle B, and then calculate the parking capacity Bp in the entire parking lot P for the large vehicle B.

[0038] The parking capacity calculation unit 13 can also calculate the number of parked cars Sp in the entire parking lot P for the small car S based on the estimated proportion of the "number of parked cars" in the entire shared space PC for the small car S. However, it is necessary to calculate the estimated proportion 1-R of the "number of used spaces" in the entire shared space PC for the small car S based on the estimated proportion of the "number of parked cars" in the entire shared space PC for the small car S, and then calculate the number of parked cars Sp in the entire parking lot P for the small car S.

[0039] (Parking rate calculation process of the present disclosure) The parking rate calculation process of the present disclosure is shown in Fig. 7. A specific example of the parking rate calculation of the present disclosure is shown in Fig. 8 and Fig. 9. The display of the parking rate of each vehicle type of the present disclosure is shown in Fig. 10.

[0040] The parking rate calculation unit 14 executes the processes of steps S7 to S13 at predetermined time intervals.

[0041] The parking rate calculation unit 14 calculates the current parking rate or congestion degree Pb=Bt / Bp*100[%] for large vehicle B based on the current number of parked large vehicles Bt and the number of large vehicles B that can be parked in the entire parking lot P for large vehicles B (step S7). Here, it is assumed that large vehicles B are parked evenly in the spaces used for large vehicles B (parking spaces PB for large vehicles B and shared spaces PC) and are not parked in the spaces used for small vehicles S (parking spaces PS for small vehicles S and shared spaces PC) until the spaces used for large vehicles B (parking spaces PB for large vehicles B and shared spaces PC) are full.

[0042] The parking rate calculation unit 14 calculates the current parking rate or congestion degree Ps=St / Sp*100[%] for small vehicles S based on the current number of parked small vehicles S St and the number of small vehicles S that can be parked in the entire parking lot P (step S8). Here, it is assumed that small vehicles S are parked evenly in the spaces used for small vehicles S (parking spaces PS for small vehicles S and shared spaces PC), and are not parked in the spaces used for large vehicles B (parking spaces PB for large vehicles B and shared spaces PC) until the spaces used for small vehicles S (parking spaces PS for small vehicles S and shared spaces PC) are full.

[0043] When the parking rate or congestion level Pb of the large vehicle B exceeds 100% (step S9, YES), the parking rate calculation unit 14 considers that the large vehicle B will park in the space used for the small vehicle S (parking space PS and shared space PC for the small vehicle S). That is, based on how many large vehicles B are excluded from the number of large vehicles B that can be parked in the entire parking lot P for the large vehicle B (=Bt-Bp) and how many small vehicles S one large vehicle B is converted into (=2), the parking rate or congestion level Ps={St+2(Bt-Bp)} / Sp*100[%] of the small vehicle S when the large vehicle B is parked in the space used for the small vehicle S (parking space PS and shared space PC for the small vehicle S) (step S10). Note that when the parking rate or congestion level Pb of the large vehicle B does not exceed 100% (step S9, NO), step S10 is not executed.

[0044] In FIG. 8, the number of large vehicles B that can be parked in the entire parking lot P is 15, but the number of parked large vehicles B this time is 19, so the parking rate or congestion level Pb for large vehicles B this time is 127%. Therefore, taking into consideration the number of parked small vehicles S this time, St, 6, and the number of small vehicles S that can be parked in the entire parking lot P is 20, the parking rate or congestion level Ps for small vehicles S this time is {6+2(19-15)} / 20*100[%]=70[%]. Note that the upper limit of the parking rate or congestion level Pb for large vehicles B this time is set to 100%.

[0045] When the parking rate or congestion level Ps of the current small vehicle S exceeds 100% (step S11, YES), the parking rate calculation unit 14 considers that the small vehicle S will be parked in the space used for the large vehicle B (parking space PB and shared space PC for the large vehicle B). That is, based on how many small vehicles S are excluded from the number of small vehicles Sp that can be parked in the entire parking lot P for the small vehicle S (=St-Sp) and how many large vehicles B one small vehicle S is converted to (=0.5), the parking rate or congestion level Pb={Bt+0.5(St-Sp)} / Bp*100[%] of the current large vehicle B when the small vehicle S is parked in the space used for the large vehicle B (parking space PB and shared space PC for the large vehicle B) is calculated (step S12). Note that when the parking rate or congestion level Ps of the current small vehicle S does not exceed 100% (step S11, NO), step S12 is not executed.

[0046] In Fig. 9, the number of small vehicles S that can be parked in the entire parking lot P is 20, but the number of parked small vehicles S this time is St = 32, so the parking rate or congestion level Ps for small vehicles S this time is 160%. Therefore, taking into consideration the number of parked large vehicles Bt = 6 this time and the number of large vehicles B that can be parked in the entire parking lot P for large vehicles Bp = 15, the parking rate or congestion level Pb for large vehicles B this time is {6 + 0.5 (32 - 20)} / 15 * 100 [%] = 80 [%]. Note that the upper limit of the parking rate or congestion level Ps for small vehicles S this time is set to 100%.

[0047] The parking rate calculation unit 14 calculates the current parking rate or congestion level Pa = 2 / (1 / Pb + 1 / Ps) (harmonic mean of Pb and Ps) for all vehicle types based on the current parking rate or congestion level Pb for large vehicle B and the current parking rate or congestion level Ps for small vehicle S (step S13).

[0048] In FIG. 10, for large vehicle B, if the parking rate or congestion level Pb is 0-50% or 50-100%, the congestion level is determined as vacant or congested, respectively. Then, a bar graph is displayed that the parking rate or congestion level Pb is 70%. For small vehicle S, if the parking rate or congestion level Ps is 0-60% or 60-100%, the congestion level is determined as vacant or congested, respectively. Then, a bar graph is displayed that the parking rate or congestion level Ps is 80%. For all vehicle types, if the parking rate or congestion level Pa is 0-40%, 40-70%, or 70-100%, the congestion level is determined as vacant, congested, or full, respectively. Then, a bar graph is displayed that the parking rate or congestion level Pa is 80%.

[0049] The parking rate calculation unit 14 notifies the current parking rates or congestion levels Pb, Ps, Pa of large vehicles B, small vehicles S, and all vehicle types to the parking availability information board control device 2 via the network 6. The parking availability information board control device 2 outputs the current parking rates or congestion levels Pb, Ps, Pa of large vehicles B, small vehicles S, and all vehicle types to the parking availability information board 3 via the network 6.

[0050] (Effects of the parking lot congestion calculation system disclosed herein) Instead of using an imaging system that monitors part of the parking lot P (which has low installation and maintenance costs but low accuracy in determining the parking rate or congestion rate), or an embedded system that is installed in each parking space (which has high accuracy in determining the parking rate or congestion rate but high installation and maintenance costs), it is possible to use radar transmitters and receivers 4 and 5 that monitor the entrances and exits of the parking lot P (which has low installation and maintenance costs, high accuracy in determining the parking rate or congestion rate, and is not affected by the surrounding weather, etc.).

[0051] When there is a shared space PC for large vehicles B and small vehicles S, it is taken into consideration that large vehicles B will park not only in the parking space PB for large vehicles B, but also in the shared space PC for large vehicles B and small vehicles S, so the parking rate or congestion degree Pb for large vehicles B can be calculated with high accuracy.

[0052] When there is a shared space PC for a small vehicle S and a large vehicle B, it is taken into consideration that the small vehicle S will be parked not only in a parking space PS for small vehicles S, but also in the shared space PC for small vehicles S and large vehicles B, so the parking rate or congestion degree Ps for the small vehicle S can be calculated with high accuracy.

[0053] When there is a shared space PC for a large vehicle B and a small vehicle S, the estimated proportion R of the number of spaces used by the large vehicle B in the total shared space PC is set according to the time of day (morning, afternoon, night, etc.) or date (holidays, etc.), so that the parking rate or congestion level Pb of the large vehicle B can be calculated with high accuracy.

[0054] When there is a shared space PC for a small vehicle S and a large vehicle B, the estimated ratio 1-R of the number of spaces used in the entire shared space PC for the small vehicle S is set according to the time of day (morning, afternoon, night, etc.) or date (holidays, etc.), so the parking rate or congestion level Ps for the small vehicle S can be calculated with high accuracy.

[0055] When there is a shared space PC for large vehicles B and small vehicles S, and when the parking rate or congestion level Pb of large vehicles B is high, it is taken into consideration that large vehicles B will park in a space used for small vehicles S, so that the parking rate or congestion level Ps of small vehicles S can be calculated with high accuracy.

[0056] When there is a shared space PC for a small vehicle S and a large vehicle B, and when the parking rate or congestion level Ps of the small vehicle S is high, it is taken into consideration that the small vehicle S will be parked in a space used by large vehicles B, so the parking rate or congestion level Pb of the large vehicle B can be calculated with high accuracy.

[0057] (Modifications to the present disclosure) In the present disclosure, when there is a shared space PC for large vehicles B and small vehicles S, the parking rates or congestion levels Pb, Ps for large vehicles B and small vehicles S are calculated. In a modified example, when there is no shared space PC for large vehicles B and small vehicles S, the parking rates or congestion levels Pb, Ps for large vehicles B and small vehicles S may be calculated. Specifically, the following process may be executed.

[0058] The parking rate calculation unit 14 calculates the current parking rate or congestion level Pb=Bt / Bmax*100[%] for large vehicles B based on the current number of parked large vehicles B and the number of parking spaces Bmax for large vehicles B. Then, when the current parking rate or congestion level Pb for large vehicles B exceeds 100%, it calculates the current parking rate or congestion level Ps={St+2(Bt-Bmax)} / Smax*100[%] for small vehicles S when large vehicles B are parked in parking spaces PS for small vehicles S based on how many large vehicles B are excluded from the parking spaces PB for large vehicles B (=Bt-Bmax) and how many small vehicles S one large vehicle B is converted into (=2).

[0059] The parking rate calculation unit 14 calculates the current parking rate or congestion level Ps=St / Smax*100[%] for small vehicles S based on the current number of parked small vehicles S St and the number of parking spaces for small vehicles Smax. Then, when the current parking rate or congestion level Ps for small vehicles S exceeds 100%, it calculates the current parking rate or congestion level Pb={Bt+0.5(St-Smax)} / Bmax*100[%] for large vehicles B when a small vehicle S is parked in a parking space PB for large vehicles B based on how many small vehicles S are excluded from the parking space PS for small vehicles S (=St-Smax) and how many large vehicles B one small vehicle S is converted to (=0.5).

[0060] In the present disclosure, large vehicles B and small vehicles S are considered as all vehicle types, and the size ratio between large vehicles B and small vehicles S is set to 2:1. In a modified example, three or more types of vehicle types may be considered as all vehicle types, and the size ratio between these vehicle types may be set to any ratio. The calculation of the number of parking spaces and the parking rate may be performed in substantially the same manner as described above. [Industrial Applicability]

[0061] The parking lot congestion degree calculation device, parking lot congestion degree calculation program, and parking lot congestion degree calculation system disclosed herein can be applied to parking lots on expressways and general roads. [Explanation of symbols]

[0062] C: Parking lot congestion calculation system P: Parking lot LI: Entrance lane MI: Inlet measurement area LO: Exit lane MO: Exit measurement area B: Large vehicle S: Small car PB: Parking space PS: Parking space PC: Shared space 1: Parking lot congestion calculation device 2: Vacancy information board control device 3: Vacancy information board 4: Radar transmitter and receiver 5: Radar transmitter and receiver 6: Network 11: Entry and exit count calculation section 12: Parking space calculation section 13: Parking capacity calculation section 14: Parking rate calculation section

Claims

1. a parking number calculation unit that calculates the current number of parked vehicles of each vehicle type based on the previous number of parked vehicles of each vehicle type, the most recent number of entering vehicles of each vehicle type, and the most recent number of exiting vehicles of each vehicle type; a parking rate calculation unit which calculates the current parking rate or congestion rate of each vehicle type based on the current number of parked vehicles of each vehicle type and the number of parking spaces for each vehicle type, and calculates the current parking rate or congestion rate of other vehicle types when the vehicle type is parked in a parking space for other vehicle types based on how many vehicles of the vehicle type are excluded from the parking space for the vehicle type when the current parking rate or congestion rate of the vehicle type exceeds 100% and how many vehicles of the vehicle type are converted into one vehicle of the vehicle type; A parking lot congestion degree calculation device comprising:

2. The parking lot further includes an entry / exit number calculation unit that acquires radar reflection point information from radar transmitting / receiving devices installed at the parking lot entrance and the parking lot exit, identifies each vehicle type based on clustering of the radar reflection points, and calculates the most recent number of entering vehicles of each vehicle type and the most recent number of exiting vehicles of each vehicle type.

2. The parking lot congestion degree calculation device according to claim 1 .

3. 3. A parking lot congestion degree calculation program installed in a computer to cause the computer to function as the parking lot congestion degree calculation device according to claim 1 or 2.

4. A parking lot congestion degree calculation device according to claim 1 or 2, A radar transmitting / receiving device is installed at the entrance and exit of the parking lot; A parking lot congestion degree calculation system comprising:

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